I tried to cancel five days into the 7-day trial period. I couldn't find any way to cancel my subscription on the website, so I used their "contact us" form. They still charged me the $19.95 at the end of the 7 days. I immediately responded with an email pointing out that I had canceled before the 7 days were up, and asking for reversal of charges. After 5 days, there has still been no response.
As far as I can tell, and given what others have reported, the "Try us for 7 days, cancel at any time" promise is a flat out lie.